Improvement in mode of attaching screws to knobs



. animi sampmn-l W. EDsoN DooLITTLE, CE WEsT HAVEN, CONNECTICUT.

Leners Patat No. 92,80'1, zaad July 2o, 1869.

IMPROVEMENT IN MODE OF ATTACHING- SCREWS' T0 KNOBS.

The Schedule referred to in these Letters Patent and making part of the same.

To all rwhom c't may concern: Beit known that I, W. EDsoN DooLrrrLn, of the village of West Haven, in the town of Orange, in theconnty of New Haven, in the Statev of Connecticut, have invented a new and improved Mode of AAttaching Metallic Screws to Knobs made of glass or other plastic material; and I 'do hereby declare that the following is a full and exact description thereof, reference .being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature of myinvention consists in permanently aixing a lmetallic screw, A,.to a metallic shell, B, by

soldeling, bra'zing, or otherwise, which metallic shell is to be made with holes or corrugations, or both, in the sides or bottom, or both, into which metallic shell B, the glass or other plastic material C is to be pressed, while in a plastic state, filling the hples and flowing around the. corruga-tions, and therev hardening, and permanently aixing itself..

To enable others skilled in the art to make and use my invention, I will proceed to describe itsconstruction and operation.

I construct my knobs in any of .the known forms, v

and of glass or'other plastic material; and while the .glass-or other plastic material is in a plastic state, it is pressed into the metallic shell B, which has holes or corrugations, or both, in the sides or bottom, or both,

4the glass or other plastic material illing the holes and lowingaround the corrugations, thus preventing the knob from heilig separated from the metallic shell B, after the glass or other plastic material C has hardened; and to the metallic shell B, I affix 'the metallic screw A, either before'or after the glass or other plastic maten'al is pressed in. Iii-general, I aix themetallic screw A to themetallic shell B, previous to pressing in the glass or other plastic material O, by soldering, brazing, or otherwise. I generally use, also, 'a

metallic screw, A, the head of which is attened. The

solder, iiowing around the flattened sides, assists to Y prevent the ,metallic screw A from turning around in the metallic shell B when the knob is being screwed in place.

What I'claim as my invention, and desire to secure f by Letters Patent, is

The knob, when securedto the screw and shell or v `cap B, by'means of corrugations or. holes, and the material forced into the cap when in a limpid or plastic state, as shown and described.

W.- EDSON DOOLITTLE.

Witnesses: l

H. H. RICHARDS, T.. B. FAmcHILn. 

